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F. X. DRULET.

VALVE GEAR FOR ENGINES.

A uclleion filed Aug. 9, 1898.)

(No Model.)

2 Sheets-Sheet l,

\ No. 624,I96. Patented May 2, I899. 1

WITNESSES: mvmfioa X i (Wm QZ@MZ$ BY 7 ATTORNEY- No. 624,l96. Patented May 2, I899. F. X. DROLET.

VALVE GEAR FOR ENGINES.

(Application filed Aug. 9, 1898.: t (No Model.) 2 Sheets-Sheet 2.

0 mvemon 0,2121% JA 7 W ATTORNEY THE mums PETERS 00.. Pno'roumo. wnsnlnmou. n. c.

UNITED STATES PATENT. OFFICE.

. FRANQOIS XAVIER DROLET, OF ST. ROCH, CANADA.

VALVE-GEAR FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 624,196, dated May 2, 1899.-

Applioation filed August 9,1898. Serial No. 688,183. (No model.)

' To all whmn it may concern: 7

dicated by line 00 inFig. 1.

-the steam will be automatically out off from the engine if the governor-belt breaks or the governor ceases to work from any cause and,

in part, to provide quick opening and closin g valves.

An embodiment of the invention is illustrated in the accompanying drawings, wherem Figure 1 is a side elevation of the enginecylinder of the engine provided with the valve-gear and mechanism. Fig. 2 is a vertical transverse section through the valves at one end of the cylinder, the plane being in Fig. 3 is a vertical transverse section (not including the engine-cylinder) in the plane indicated by line a in Fig. 1.

1 is the engine-cylinder, 2 2 the inductionvalve chests, and 3 3 the eduction or exhaust valve chests.

4 4 are the inlet-pipes in the chests 2 2, and 5 5 are the exhaust-valves in the chests 3 3. Fig. 2 shows the chests and valves at one end of the cylinder, and those at the opposite end are the same. 7

4 4? are the stems of the inlet-valves 4, provided with suitable dash-pots 4", and 5 5 are the stems of the exhaust-valves 5, provided also with suitable dash-pots 5 These pots are supported by arms on the face-covers of the valve-chests.

6 and 7 are rock-shafts, the former carrying arms b for actuating the inlet-valves and the latter carrying arms 7 which operate the exhaust-valves. The rounded ends of the arms, Fig. 2, engage rounded recesses in the respective valve-stems.

Sis a cam-shaft, on which are cams S,which act on arms 7 on the rock-shaft 7 to rock the latter. On the shaft 8 are splined cams 8 which act on arms '6" on the rock-shaftfi to rock the latter.

'9 is-the governor-rod, coming from an ordinary ballgovernor. (Not shown.) The governor in its speed fluctuations-imparts an up-and-down movement to the rod 9 in a wellknown Way. At its lower end the rod 9 has screwed on it a sleeve 10, carrying an annulus 10, which engages the forked extremities of the horizontal arms of two bell-crank 1evers 11 ll, fulcrumed on a frame 12, the pend- 'ent arms of said bell-crank levers being forked and each embracing the boss of one of the cams 8 to which they are pivotally attached. Preferably the forked extremity of the lever-arm will be pivotally secured to a ring ,rotatively mountedin a keeper-groove in the cam-boss.

The cam 8 has a spirally-inclined margin to its raised cam-surface, whereby when the cam is shifted along the spline through the agency of the governor and the intermediate mechanism above described the steam will be out ofi at difierent points of. the stroke.

The valves and valve seats, as clearly shown in Fig. 2, are of grid or register form, so that a veryslight movement of the valve opens or closes the port fully. The admission of steam is thus effected quickly, and the inlet-port is also closed quickly, remaining closed during expansion, if the steam be cut off at a fraction of the stroke. At the end of the stroke the exhaust opens quickly, and it remains open until the moment the induction-valve opens.

Should the governor cease to rotate from any cause, the cams 8 will be moved inwardly toward each other to such an extent as to be inoperative on the induction-valves, and the latter will therefore not open and admit steam.

13 is the steam inlet or supply pipe, and 14 the exhaust-pipe.

The cams 8 may be adjusted withrespect to the governor so as to elfect the desired cutoif by adjusting the sleeve 10 up or down on the governor-rod, the lock-nuts 1O securing it where set.

The cam-shaft 8 will be driven from the engine-shaft in a well-known way. This is too common a feature to require illustration.

In Fig. 1 the frame 12 is partly broken away to avoid obscuring the more important parts, and in Figs. 2 and 3 parts back of the plane have beenomitted in order tom'ake the drawings clear. The extremities of the arms 6 (see Fig. 1) are beveled laterally to correspond substantially to the oblique lateral faces of the cut-off earns 8 eral faces on the eXha'ustcamsS is to vary the point of compression in setting these cams.

Any good governor may be used, as-the Porter governor, for example.

I am Well aware that grid-like valves and seats are not in themselves new and that it is not broadly new to control the induction of steam from a governor by rotating cam with an inclined face. These features I do not claim. Thenovel features of my invention are the four gridiron-Valves and the four'ca'ms for actuating them, arranged and operating as shown, and the construction whereby the f stopping of: the-governor from any cause closesa-circumferential groove engaged by a fork on" the pendent arm ofone of saidb'ell crank levers, and valve-operating mechanism bea The oblique latdescribed my invention,

tween said cams and the respective valves controlling the induction-ports of the engine, whereby should the governor cease to rotate, the said cams will be simultaneously shifted into inoperative positions, as set forth.

2. In avalve mechanism for steam-engines, the combination with the cylinder, provided with two induction and two exhaust ports, all

provided with grid-like valve-seats, the four grid-like valves controlling the said ports,

the rock-shaft 6, the arms 6 fixed on said rock-shaft and engaging the stems of the respective induction-valves, the arms 6", fixed on said rock-shaft-andbearing on" the respectivecamsS, the cams 8 fixed on the camshaft, the rock-shaft 7, the arms 7, fixed thereon and' en gaging the-stems 0fthe-respective exhaust-valves, the arms 7 fixed on' said z shaft 7 and bearing on the respective cams 8 the rod 9 of the governor, and means between said governor and the cams'8 fol-displacing them simultaneously in opposite directions,

substantially as set forth.

In witn'ess whereof I have hereunto signed l my name, this4th day of August, 1898, in the presence of two subscribing Witnesses.

FRANQOIS- XAVI'ER DROLET. Witnesses:

ELZI'JAR- AUDI-BERT, EUGENE VocELLE. 

